Syringe



Sept. 27,1921. 1,643,744

- LOWENFELD SYRINGE Filed July 10, 1926 Patented Sept. 27, 1 927.

UNITED STATES 1, 43,744. PATENT OFFICE.

HENRY LoWENrnLn, or PARIS, FRANCE.

I SYRINGE.

Application filed July 10, 1926, Serial No. 1219632,, aim Belgium m 13, 1925. I

This invention relates to improvements in syringes, and. in. particular, to syrlnges used for the transfusion of blood.

The invention has for its'chief object to so construct suchsyringes so that they function better. V I

In order that the .invention may be more clearly understood, it'will now be'described with reference to the accompanying draw 10 ing, which is given merely by way of, example' v Fig. 1 shows an axial section of a syr nge for the transfusion of blood constructed according toone method of carrying out the invention, k

Fig. 2 is a similar view of a modified construction of'a syringe for the same purpose.

Referring to thedrawing'ska is a cylinder,,preferably of. glass, closed at one end by a base I), in or near which 15 provided a chamber b adapted to receive a distributor element. This may consist of a small cylindrical or plain sliding sleeve 0,

adapted'to be displaced or reciprocated' in the said chamber b so that itputs the interior of the cylinder at in communication, when said sleeve 0 is moved to the end of its upstroke, with an admission passage 05. lVhen said sleeve 0 is moved to the end of the downstroke,

cylinder a in communication with the de- .hv yp p a v In the construction shown in Fig. 1, the

chamber'b is so arranged that its axis is in alignmentwith the axis of thecylinder a; and the cylindrical sliding sleeve 0 1s so formed that the liquid can atrequired t mes pass longitudinally through it. Two vradial passages are providedin the base?) into 40 which the tubes (Z and e are screwed or otherwise inserted, In this way, as previously stated, when the sliding member 0 is at the end of the upstroke, it uncovers the admission passage of base I), which passage is then in communication with the chamber 5 and through the passage in the slide 0 with the interior of the cylinder (1. When the slide 0 is at the end of the downstroke, it uncovers the delivery pipe 6, which pipe is then in communication with the chamber b and is directly in communication with the interior of the cylinder.

Alternatively, as shown in Fig. 2, the

chamber 6 may be formed in a laterally extending portion of the baseb, with its-axis parallel to the axis of the cylinder a. is is it puts the interior of the the removable cover ofthis chamber and it is provided with'springs' Z to press j downthe sleeve during its sliding movement. The

chamber 6 is connected to the interior of the cylinder a by means of a single passage 6 passing through the base 6. 'lhe'sliding element 0 is provided with two diamet ric holes into which are fixed respectively the nozzles d and 6. These nozzles project through a slot. 6 in the wall of the chamber, this enabling the element 0 to reciprocate. WVhen the sliding member 0 is at theend of the, upstroke, the tube d registers withkthe conduit b flwhilst, when it is at the end of the downstroke, the tube 0 registers with the conduit b f is a piston adapted to reciprocate in the cylinder at, and provided with a rod f 1 In the constructionshown in Fig. l, the rod f is tubular and adapted to receive an inner rod 7&1 which is also tubular and is attached to or formed with thehandle h. 71 is a suitable pin fixed to the rod 7L and movable in a slot in the rod 7, the length of thisislot being equal to the stroke of the slide 0.v The. rod 11 and the piston f are provided. with a bore, theiniier wall of which is adapted to frictionally grip the rod '0 of the sliding element 0. This rod 0 has a split end j to engage the bore of the rod 7?. In this way the rod 0 and consequently-the slidingele inent oftend to be drawn along when the rod h. isldisplaced in either direction. If for example, the piston is at-the bottom of its stroke and hence the sleeve valve 0 is in its 1 Qbottom position, an upward ipull upon this handle it causes the sleeve valve '0 to bemoved to its upper position before the pinz' of the rod h contacts with the upper end of the slot in the piston rod f Hence, th e.-positio11 of the sleeve valves is reversedat the end of.

each stroke, before the movement of the piston f is reversed. Likewise, if the direction of movement of the piston f is reversed 1 before it has reached the end of its stroke and while said piston f is in what may be termed vanintermediate position, the movement of the handle it causes the position of the sleeve valve 0 to be reversed before the movement of the piston is reversed.

In the modified construction shown in Fig. 2, the rod '7 has an axial opening or depression in which the rod [t fits. The rod 7 and the tube it are interconnected by a'suitable pin/Z fixed to the rod f and working in a slot of a length equal to the stroke of the slide 0 and provided in the tube 7L1, 71,2 is another rod parallel to the tube h and so connected thereto that the distance between the axes of the two rods is equal to the, distance between the axis of the slide 0i and that of the piston f. 1

The rod h2 is formed tubular and is adapt- 7 ed to receive the rod 0 in connection with the sliding element 0. The rod 0 is provided with an articulation for the purpose of preventing lateral pressures.

In the particular construction shown the rod 0 is provided with a split end or the like 7' adapted to frictionally engage with r'od if so as to move the rod 0 and consequently the slide 0- in one direction or the other,'when the tube 72, is displaced in the direction of its ax1s.

The mode of operation of the devices shown in Figs. 1 and 2 is as follows: Vhen the handle it is pulled upwards in order to raise the piston f towards the end 9, rod 0 which is in frictional contact with tube It or if, exerts a pull on sliding element 0 the end ofits upstroke and establishing communication between the lower portion of the cylinder a and admission pipe at; on continuing the pull upon the handle in the same direction, the piston f is raised through the intervention of the pin 71, and liquid is drawn into the interior of the cylinder of the syringe.

p and p are two simple self stopping-devices for the sleeve.

When it is desired to deliver the liquid, the handle h is pushed down. all causes the slide a to move downwards, closing the admission tube of and opening the delivery passage 6. The pin 2' then comes into action to push the piston'f downwards, and the liquid contained in the lower portion of the cylinder a is delivered from this cylinder through the tube 6.

It is to be pointed out that the reversing movement can be carried out in any intermediate position of the. piston f. The operation always starts with a change of position of the sliding member 0. I

As has already been stated the invention isnot limited to the particular application This first of ing within a fair interpretation of the claims are included.

Having now particularly described and ascertained the nature of my said invention 'tion between the cylinder and either the inlet tube or-the outlet tube, and'frictionally operated means for shifting the position "of sa'idvalve means prior to each reversal of the piston. i 2. A device for the transfusion of blood comprising in combination a cylinder, a. piston slidably mounted therein, said piston having a piston rod connectedthereto, an inlet and an outlet tube mounted on'the same end of the cylinder, valve means interposed between the, cylinder and the inlet and outlet tubesand operable to connect either the inlet tube or the outlet tube to the'cylinder, and means operable on each reversal of movement of the piston rod to-firstmove said valve means and to then move said piston. a 7

3. A device of the class described 'comprising in combination a cylinder, an inlet and an outlet tube connected to the same end of said cylinder, a piston slidably mounted in said cylinder,- valve means controlling communication between the cylinder and'said inlet and outlet tubes, and means operable to reverse the position of said valve means in position of the piston intermediate the ends of the piston stroke, and independent of the reversal of movement of the piston at the ends of its stroke. 7 a

In testimony whereof I aflix my signature.

HENRY LO ENFELD; 

